Finding the Fourth Proportional to 8,121.52, 12,123.41 and 7,137.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,121.52 : 12,123.41 = 7,137.37 : x
2. Step 2: Convert to fraction form
   8,121.52/12,123.41 = 7,137.37/x
3. Step 3: Cross multiply
   8,121.52x = 12,123.41 × 7,137.37
4. Step 4: Simplify right side
   8,121.52x = 86,529,262.83
5. Step 5: Solve for x
   x = 86,529,262.83/8,121.52
6. Step 6: Final answer
   x = 10,654.32